| Date | | | |
| 1-Dec-1865 | | Thomas Clarke Luby found guilty and sentenced to penal servitude for 20 years. | |
| 6-Dec-1865 | | John O'Leary sentenced to penal servitude for 20 years. | |
| 7-Dec-1865 | | Michael Moore, the pikemaker, sentenced for 10 years. | |
| 9-Dec-1865 | | John Haltigan sentenced for 7 years. | |
| 12-Dec-1865 | | Jeremiah O'Donovan Rossa sentenced for life; and the Judges adjourn until 4th January, 1866. | |
| 16-Jan-1866 | | In consequence of the discovery of concealed arms, the county and city of Dublin is "proclaimed," no person is allowed to appear with firearms, and the police are empowered to search for arms. | |
| 2-Feb-1866 | | The Special Commission for the trial of Fenian Conspirators terminates. Thirty-six prisoners were convicted or pleaded guilty, three were acquitted, and in one case the jury disagreed. | |
| 9-Feb-1866 | | Fenian ammunition manufactory discovered. A man named George Clarke, who resided in Jervis street, is murdered, between the fifth and sixth locks of the Royal Canal; it is supposed on account of his having been suspected of giving information to the police in reference to the concealment of arms. | |
| 17-Feb-1866 | | An Act for the suspension of the Habeas Corpus Act in Ireland passed both Houses of Parliament, and on the same day 120 persons are arrested in Dublin. | |
| 18-Jul-1866 | | Departure of the Earl of Kimberley, Lord Lieutenant of Ireland, consequent on the resignation of Earl Russell's Administration. | |